void main(List<String> args) {
  int a = 10;
  int b = 3;
  int c = a + b;
  int d = a-b;
  int e = a * b;
  double f = a / b;
  var h = a ~/ b;
  var i = a % b;
  var j = a++;
  var k = a--;
  print('c=$c'+
  '\nd=$d'+
  '\ne=$e'+
  '\nf=$f'+
  '\n h=$h'+
  '\n j=$j'+
  '\n k=$k');
}